\begin{tikzpicture}
    \tkzDefPoints{0/0/B,  3/0/C,  1.5/2/A}
    \tkzDefPointOnLine[pos=0.4](A,B)  \tkzGetPoint{D}
    \tkzDefPointOnLine[pos=0.6](A,C)  \tkzGetPoint{E}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegments(D,E)

    \tkzLabelPoints[above](A)
    \tkzLabelPoints[left](D)
    \tkzLabelPoints[right](E)
    \tkzLabelPoints[below](B,C)
\end{tikzpicture}

